An operating apparatus for a work vehicle with a detachable implement provided with a hydraulic actuator, comprising:
a control valve and a link mechanism for operatively connecting the control valve to an operating lever, both the control valve and link mechanism being disposed beneath a driver seat of the work vehicle; and a locking lever configured to be switched between a locked position for holding the operating lever in a neutral position, and a lock-releasing position for releasing the hold on the operating lever, wherein the locking lever is disposed between the driver seat and a rear fender positioned laterally of the driver seat.
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1. An operating apparatus for a work vehicle with a detachable implement provided with a hydraulic actuator comprising:
a control valve that is disposed beneath a driver seat of the work vehicle and that controls flow of hydraulic fluid to the hydraulic actuator;
an operating lever that operates the control valve, the operating lever having a handle thereof protruding, in a lateral side view of the work vehicle, from a rear fender that is located at a lateral side of the driver seat;
a link mechanism that is disposed beneath the driver seat of the work vehicle and that operatively connects the control valve to the operating lever; and
a locking lever configured to be switched between a locked position for holding the operating lever in a neutral position, and a lock-releasing position for releasing the hold on the operating lever, wherein the locking lever is movable in a lateral direction of the work vehicle so as to be switched between the locked position and the lock-releasing position;
a holding clasp that holds the locking lever at the locked position and the lock-releasing position, wherein the holding clasp is mounted on the control valve and extends to a position adjacent the rear fender below the locking lever; and
a spring that urges the locking lever downward.
2. The operating apparatus of
the link mechanism has a first pivot member that rotates around a first axis extending left and right, and a second pivot member that rotates around a second axis extending front to back.
3. The operating apparatus of
an engaged member is fixed to either one of the first pivot member and the second pivot member;
a locking pin is operatively connected to the locking lever; and
wherein a lateral movement of the locking lever causes the locking pin to engage the engaged member, thereby holding the operating lever in the neutral position.
4. The operating apparatus of
5. The operating apparatus of
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1. Field of the Invention
The present invention relates to an operating apparatus for a work vehicle to which an implement provided with hydraulic actuators can be attached.
2. Description of the Related Art
Among implements that can be attached to work vehicles, one example of an implement provided with hydraulic actuators is a front loader provided with, i.e., hydraulic cylinders for driving a boom, hydraulic cylinders for driving a bucket, and the like. In some cases in which a front loader is installed on a work vehicle, the work vehicle is also provided with a support frame for supporting the front loader; left and right braces of the front loader are detachably connected to the support frame; and the support frame is also equipped with a boom control valve for controlling the flow of hydraulic fluid to the hydraulic cylinders for driving the boom, a bucket control valve for controlling the flow of hydraulic fluid to the hydraulic cylinders for driving the bucket, an operating lever operatively connected with these control valves via a link mechanism, and other components (for example, see Japanese Unexamined Utility Model Application No. 4-110406).
The configuration described above has an external structure in which the entire operating system for the front loader is placed on the exterior of the vehicle. Therefore, a decorative structure is needed to cover up the boom control valve, the bucket control valve, the link mechanism, and other components so that they are not exposed. The number of components increases proportionately, which leads to increases in cost, weight, and the like.
In a work vehicle equipped with a cabin, there is also a need to configure the cabin so that it can correspond to the operating system of the external structure. Therefore, the cabin structure becomes complicated, which leads to further increases in cost, weight, and the like.
An object of the present invention is to improve the operating apparatus according to the conventional art described above.
An operating apparatus for a work vehicle with a detachable implement provided with hydraulic actuators according to the present invention comprises:
a control valve that is disposed beneath a driver seat of the work vehicle and that controls flow of hydraulic fluid to the hydraulic actuator;
a link mechanism that is disposed beneath the driver seat of the work vehicle and that operatively connects the control valve to an operating lever; and
a locking lever configured to be switched between a locked position for holding the operating lever in a neutral position, and a lock-releasing position for releasing the hold on the operating lever, wherein the locking lever is disposed between the driver seat and a rear fender positioned laterally of the driver seat.
According to this configuration, the control valve and the link mechanism are positioned beneath the driver seat, thereby eliminating the need for a decorative structure for covering up the control valve and the link mechanism, and the control valve and link mechanism can be prevented from hindering occupants from boarding or driving the work vehicle. Since the operating lever is positioned in proximity to the driver seat along with the control valve and link mechanism, the operating lever can be easily operated from a seated position.
While the vehicle is not being operated, the operating lever is held in the neutral position by the locking lever, whereby the implement can be prevented from operating due to unexpected contact with the operating lever positioned in proximity to the driver seat. Placing the locking lever between the driver seat and the rear fender eliminates the need for a decorative structure for covering up the locking lever, makes it easy to operate the locking lever from a seated position, and also makes it possible to prevent the locking lever from hindering occupants from boarding or driving the work vehicle.
In the embodiment of the present invention, the link mechanism preferably has a first pivot member that rotates around a first axis extending left and right, and a second pivot member that rotates around a second axis extending front to back.
In the embodiment of the present invention, it is preferable that an engaged member be fixed to either one of the first pivot member and the second pivot member; that a locking pin be interlocked and connected to the locking lever; and that moving the locking lever to the left or right causes the locking pin to engage with the engaged member, thereby holding the operating lever in the neutral position.
In the embodiment of the present invention, the operating lever preferably has, in a region in proximity to the link mechanism, a first portion extending generally in the front-to-back direction; a second portion extending generally in the left-to-right direction from the front end of the first portion; and a third portion extending generally upward from the distal end of the second portion.
In this moving vehicle 3, an engine 7 is installed in the front part. A clutch housing 8 that has a main clutch (not shown) in the interior is connected to the rear end of the engine 7. A transmission case 9 that has a gear transmission device or the like in the interior is connected to the clutch housing 8 via an intermediate frame 10 that has a hollow structure made of sheet metal. The top side of the engine 7 is covered by a hood 11, and a front frame 12 is connected to the bottom part of the engine. A front axle case 13 that has a differential device (not shown) or the like for the front wheels in the interior is rollably supported in the front frame 12. The front wheels 1 are turnably installed in the left and right sides of the front axle case 13, and the rear wheels 2 are installed at the left and right sides in the rear part of the transmission case 9.
The power from the engine 7 is transferred via the main clutch or another component to a hydrostatic continuously variable transmission (hereinafter abbreviated as HST) 14 connected to the front end of the transmission case 9. The gear-reduced power derived from the output shaft (not shown) of the HST 14 undergoes multiple stages of gear reduction via a gear transmission device or the like, and is then distributed between front wheel drive and rear wheel drive within the transmission case 9. Power for front wheel drive is transmitted to the left and right front wheels 1 via a front wheel transmission device (not shown) provided within the transmission case 9, a front wheel intermediate transmission axle (not shown) that passes through the intermediate frame 10, a front wheel differential device, and other components. Power for rear wheel drive is transmitted to the left and right rear wheels 2 via a rear wheel differential device or the like provided within the transmission case 9. Power that has not undergone gear reduction and that is derived from the input shaft (not shown) of the HST 14 is transmitted via an operational clutch (not shown) or the like provided within the transmission case 9. This power is transmitted to a rear-PTO shaft 15 that derives operational power and that protrudes backward from the rear of the transmission case 9, and a mid-PTO shaft 16 that derives operational power and that faces forward from the lower front of the transmission case 9.
A gear change pedal 17 that is urged back to a neutral position is placed on the right side of the boarding step 6 and is allowed to swing around a fulcrum p, as shown in
A pair of left and right side brake pedals 18 is placed on the right front side part of the boarding step 6. A pair of left and right side brakes 19 for braking the corresponding rear wheels 2 is mounted within the transmission case 9. The side brake pedals 18 are operatively connected with the corresponding side brakes 19 via a link mechanism (not shown) for operative connections. It is thereby possible to make narrow turns while braking the rear wheel 2 on the inside of the turn. This can be achieved by turning the left and right front wheels 1 to either the left or right while depressing the side brake pedal 18 on the inside of the turn. It is also possible to reduce the travelling speed by simultaneously depressing both the left and right side brake pedals 18.
The left and right side brake pedals 18 are configured so that they can be connected by a connecting fixture 20, as shown in
A link mechanism 21 that enables a rotary tilling apparatus or another such rear-connecting implement (not shown) to be attached to the moving vehicle 3 is placed at the rear part of the transmission case 9, as shown in
In other words, by being connected to the link mechanism 21, a rear-connecting implement can be raised and lowered by the operation of the hydraulic cylinders. An input shaft provided to the rear-connecting implement is connected to the rear-PTO shaft 15, and operational power derived from the rear-PTO shaft 15 is transmitted to the rear-connecting implement, whereby the rear-connecting implement can be driven.
Though not shown in the drawings, a mid-mount mower or another such middle-connecting implement mounted in the longitudinal middle can additionally be provided to the moving vehicle 3 between the left and right front wheels 1 and the left and right rear wheels 2. In cases in which a middle-connecting implement is also mounted, an input shaft provided to the middle-connecting implement is connected to the mid-PTO shaft 16, and the operational power derived from the mid-PTO shaft 16 is transmitted to the middle-connecting implement, whereby the middle-connecting implement can be driven.
A control valve 25, which is used for both the hydraulic source and the hydraulic cylinders that raise and lower the lift arms, is connected to the right side of the transmission case 9 so as to be positioned directly below the right front part of the driver seat 4, as shown in
A supporting plate 27 for supporting hydraulic pipe fittings is placed to the right and in front of the boarding step 6. The supporting plate 27 is supported on the moving vehicle 3. Four hydraulic pipe fittings 28 provided with automatically closed connecting ports 28a on one side are arrayed in a vertical row along the supporting plate 27. In each hydraulic pipe fitting 28, a connecting port 28b on the other side is connected via one of four metal hydraulic pipes 29 to a corresponding port of four connecting ports (not shown) provided to the right side surface of the control valve 25.
The four hydraulic pipes 29 are aligned in two vertical rows and two horizontal rows on the reverse side of the boarding step 6. The pipes are laid so as to pass by the horizontally outward sides of an arm part 17a of the gear change pedal 17 and arm parts 18a of the side brake pedals 18, and the pipes are then switched to single vertical row alignment on the front side of the boarding step 6, where they are connected to corresponding hydraulic pipe fittings 28.
In other words, this tractor is equipped with an auxiliary hydraulic apparatus 30 comprising dual hydraulic circuitry, configured so that the excess space on the right side of the tractor is effectively utilized, and the flow of hydraulic fluid can be controlled by the cross-pattern swinging of the operating lever 26 on the right side of the moving vehicle 3. The tractor can thereby be additionally equipped with a front loader R or another such hydraulic implement that requires dual hydraulic circuitry.
The front loader R is provided with a pair of left and right braces 31 that are detachably connected to the moving vehicle 3, as shown in
After the front loader R is mounted to the front of the tractors the left and right first hydraulic cylinders 34 and second hydraulic cylinders 35 are connected to the corresponding hydraulic pipe fittings 28 via hydraulic hoses 36.
In cases in which a front loader R is mounted on the tractor, a supporting frame 38 for supporting the front loader is additionally mounted on the front frame 12, and the left and right braces 31 of the front loader R are detachably connected to the supporting frame 38.
A first bracket 39 shaped as a U as seen from the side is connected by bolts to the top end of the control valve 25, as shown in
A first supporting piece 43a and a second supporting piece 43b are erected within the concave space in the first bracket 39. A first operative connecting link 44a is supported by the first supporting piece 43a and is capable of swinging up and down about a first fulcrum a. A second operative connecting link 44b is supported by the second supporting piece 43b and is capable of swinging up and down about a second fulcrum b. The free end of the first operative connecting link 44a is connected by a pin to the top end of the first spool 25a. The free end of the second operative connecting link 44b is connected by a pin to the top end of the second spool 25b.
A operative connecting arm 41a that extends forward is provided to the first pivot member 41. An operative connecting pin 42a that extends horizontally outward is provided to the second pivot member 42. The operative connecting arm 41a is operatively connected with the middle of the first operative connecting link 44a via a first operative connecting member 45a that has a ball joint. The operative connecting pin 42a is operatively connected with the middle of the second operative connecting link 44b via a second operative connecting member 45b that has a ball joint.
As a result of the configuration described above, the spools 25a, 25b automatically return to their neutral positions when the operating lever 26 is not being operated, whereby the handle 26a of the operating lever 26 is positioned in the neutral position. When the handle 26a of the operating lever 26 is operated forwards or backwards, the first pivot member 41 rotates around the axis x oriented to the left and right in accordance with this operation, the first operative connecting member 45a is displaced vertically, and the first operative connecting link 44a swings vertically about the first fulcrum a, whereby the first spool 25a slides vertically in relation to the valve body 25c. When the handle 26a of the operating lever 26 is operated to the left or right, the second pivot member 42 rotates around the axis y oriented front to back in accordance with this operation, the second operative connecting member 45b is displaced vertically, and the second operative connecting link 44b swings vertically about the second fulcrum b, whereby the second spool 25b slides vertically in relation to the valve body 25c.
In other words, the link mechanism 23 used for operative connections to operatively connect the spools 25a, 25b of the control valve 25 with the operating lever 26 is substantially accommodated within the concave space of the first bracket 39 and the concave space of the second bracket 40 above the control valve 25 by the use of the first pivot member 41, the second pivot member 42, the first operative connecting link 44a, the second operative connecting link 44b, the first operative connecting member 45a, the second operative connecting member 45b, and other components.
In this tractor, the link mechanism 23 is thereby placed together with the control valve 25 within the excess space between the right-side rear fender 24 and the transmission case 9 formed directly below the right front part of the driver seat 4. The control valve 25 and link mechanism 23 are arranged so as not to protrude past the driver seat 4 in a plan view.
The first bracket 39 shaped as a U as viewed from the side and the second bracket 40, which is shaped as a U in a plan view and is used to support the operating lever 26 and the link mechanism 23, are connected in the shape of a very strong box having excellent shape retention, whereby the operating lever 26 and the link mechanism 23 can be supported in a very strong and stable manner.
Moreover, the first bracket 39 and the second bracket 40 are separably connected by bolts whereby, for example, the first bracket 39 that attaches the first operative connecting link 44a and the second operative connecting link 44b is connected by bolts to the top end of the control valve 25, the first operative connecting link 44a is connected to the first spool 25a, and the second operative connecting link 44b is connected to the second spool 25b when the link mechanism 23 is attached to the top end of the control valve 25. The second bracket 40 that attaches the first pivot member 41, the second pivot member 42, the first operative connecting member 45a, and the second operative connecting member 45b is then connected by bolts to the first bracket 39; the first operative connecting member 45a is connected to the first operative connecting link 44a; and the second operative connecting member 45b is connected to the second operative connecting link 44b, whereby the link mechanism 23 can be simply attached to the top end of the control valve 25.
In cases in which a front loader R is mounted, the first hydraulic circuitry, whose flow of hydraulic fluid is controlled by the first spool 25a, is designed with the hydraulic pipe fittings 28 of the first hydraulic circuitry connected via the hydraulic hoses 36 to the first hydraulic cylinders 34 for driving the booms. In this design, the hydraulic pipe fittings 28 of the first hydraulic circuitry are connected so that operating the handle 26a of the operating lever 26 forward from the neutral position causes the first hydraulic cylinders 34 for driving the booms to retract and lower the left and right booms 32. Conversely, operating the handle 26a of the operating lever 26 backward from the neutral position causes the first hydraulic cylinders 34 for driving the booms to extend and raise the left and right booms 32.
The second hydraulic circuitry, whose flow of hydraulic fluid is controlled by the second spool 25b, is designed with the hydraulic pipe fittings 28 of the second hydraulic circuitry connected via the hydraulic hoses 36 to the second hydraulic cylinders 35 for driving the bucket. In this design, the hydraulic pipe fittings 28 of the second hydraulic circuitry are connected so that operating the handle 26a of the operating lever 26 to the left from the neutral position causes the second hydraulic cylinders 35 for driving the bucket to retract and swing the bucket 33 upward in a scooping motion. Conversely, operating the handle 26a of the operating lever 26 to the right from the neutral position causes the second hydraulic cylinders 35 for driving the bucket to extend and swing the bucket in a dumping motion.
The operating lever 26 is configured so as to be able to be engaged and held at the neutral position by a locking lever 37, as shown in
An extension spring 46 that swingably urges the locking lever 37 downward is provided extending between the locking lever 37 and the first bracket 39. A holding clasp 47 is mounted on the second bracket 40, and this holding clasp is formed from a first concavity 47a for engaging and holding the locking lever 37 urged slidably downward in a locked position r, and a second concavity 47b for engaging and holding the locking lever 37 in a lock-releasing position ur. The second pivot member 42 is provided with a boss 42b (engaged member) through which the locking pin 37a can be inserted when the handle 26a of the operating lever 26 is in the neutral position.
In the configuration described above, when the vehicle is not being operated, the locking lever 37 slides from the space S to the locked position r on the inward side of the vehicle body, the locking pin 37a is inserted through the boss 42b of the second pivot member 42, and the locking lever 37 is then urged by the extension spring 46 to engage with the first concavity 47a, whereby the operating lever 26 can be restrained from swinging in the cross formation (see
In other words, the operating lever 26 is arranged so that the handle 26a is positioned above the front part of the right-side rear fender 24, which is in proximity to the driver seat 4, thus improving the operability of the operating lever 26. Additionally, while the vehicle is not being operated, the locking lever 37 is in the locked position r; thereby preventing the front loader R from being operated by unexpected contact with the operating lever 26.
Placing the locking lever 37 in the space between the right-side rear fender 24 and the driver seat 4 in proximity to the driver seat 4 makes it possible to prevent the locking lever 37 from being a hindrance to occupants boarding the tractor, while improving the operability of the locking lever 37.
A rubber mat 48 is laid on the boarding step 6, as shown in
The mat 48 can thereby be attached to the boarding step 6 without providing rivets or other such fasteners for attaching the mat. It is also possible to avoid compromising aesthetic value as a result of rivet heads or the like being exposed in the front surface of the mat 48.
Considering the possibility that the mat 48 could be overturned by external forces acting on the external periphery of the mat 48, the flanges 48b are formed into fan shapes in the proximal end sides of the corresponding protuberances 48a, as shown in
It is thereby easy to insert and remove the protuberances 48a into and out of the attachment holes 6a, in comparison with a case in which the flanges 48b are formed into circles. Additionally, it is possible to prevent the protuberances 48a from being drawn out of the attachment holes 6a by external forces acting on the external periphery of the mat 48, similar to a case in which the flanges 48b are formed into circles.
[1] Instead of a tractor, the work vehicle may be a riding-type rice planter or the like.
[2] Instead of a front loader, the implement R may be a snow removal apparatus, a mower, or any other apparatus that has hydraulic actuators 34, 35.
[3] Instead of hydraulic cylinders, the hydraulic actuators 34, 35 may be hydraulic motors or the like.
[4] The configuration and number of mountings of the control valve 25 allow for various modifications. For example, the control valve 25 may be configured with one or three or more spools provided to a single valve body 25c. Another possibility is to provide two or more control valves 25 beneath the driver seat 4.
[5] The shape and number of mountings on the operating lever 26 allow for various modifications in accordance with the configuration and number of mountings on the control valve 25, and other factors.
[6] The configuration of the link mechanism 23 allows for various modifications in accordance with the configuration and number of mountings on the control valve 25, the configuration and number of mountings on the operating lever 26, and other factors.
[7] The arrangement of the control valve 25 and link mechanism 23 allows for various modifications, as long as they are positioned beneath the driver seat 4 so as not to interfere with passengers boarding the work vehicle or with the operation of the work vehicle.
[8] The locking lever 37 may also be positioned between the driver seat 4 and a left-side rear fender 24.
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| May 07 2008 | MASUMOTO, KOJI | Kubota Corporation | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 021044 | /0817 |
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